compress: Prevent call stack overflow

compress: Prevent call stack overflow

Explicitly use goto to turn a recursive call into an iterative one.
Most compilers do this on their own with default settings, but MSVC
with default settings would create a binary which actually performs
recursive calls.

Fixes call stack overflow in binaries compiled with low optimization.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>